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Assembled Tank Shell Buckling

Thursday, September 01, 2005   By: BKA
Can anyone recommend a good reference or some insight for evaluating an assembled tank shell for both dead and live loads? One scenario that comes to mind is the load transferred to the shell by a self-supported dome roof. Another is an agitator bridge mounted to vertical supports across an open top tank. Another condition would be a point load (tension or compression) on the shell wall. Any good reference materials or opinions would be appreciated. Thanks.

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Thursday, September 01, 2005   By: Stephen H
Load transferred to the shell by a self-supported dome roof- figure axial stress and moment in tank shell, compare to allowable axial stress from AWWA D100, API-620 or other sources. Agitator bridge mounted to vertical supports across an open top tank: For vertical load, assume the load spreads out from the supports at, say, a 30 degree flare (IE, 30 degrees each way). Calculate allowable compression in the shell, find minimum width of shell required to support load, and then use the 30-degree line to find depth of supports. This is pretty approximate, as you might imagine. For radial load, if the specified loading falls into one of the circular-ring cases in Formulas For Stress and Strain, use it. You may have to make assumptions about how the shear stress is distributed from the shell to the ring. Point load (tension or compression) on the shell wall. If the load is vertical, use the bridge approach above. If the load is radial, it gets more complicated. WRC-297 is one reference for local loads on a cylinder. Some of the vessel handbooks have simplified approaches to this loading. Be aware that it may be easier to weld a stiffener to a tank shell than to show by analysis that it is not required. We have customers who insist that every ladder support have a little plate under it (1/4" thick plate to distribute load into a 1.8" shell plate, no less). Ask back with more specific questions if responses above aren't what you're after. References: WRC 107 WRC 297 Formulas for Stress and Strain by Roark- Pressure Vessel Handbook by Eugene F. Megyesy Pressure Vessel Design Manual by Dennis Moss Pressure Vessel Design Handbook by Henry H. Bednar

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Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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